package com.gaolei.zuul.config;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

/**
 * @Author: Gaolei
 * @Date: 2019/7/2 20:00
 */
@Component
public class MyFilter extends ZuulFilter {
    private static Logger log = LoggerFactory.getLogger(MyFilter.class);
    @Override
    public String filterType() {
        //  pre：路由之前;routing：路由之时;post： 路由之后;error：发送错误调用
        return "pre";
    }
    @Override
    public int filterOrder() {
        //过滤的顺序
        return 0;
    }

    @Override
    public boolean shouldFilter() {
        //true 始终过滤 ，false 不过滤，也可以自己实现逻辑判断
        return true;

    }

    @Override
    public Object run() throws ZuulException {
        //过滤器的具体逻辑。可用很复杂，包括查SQL，NoSQL去判断该请求到底有没有权限访问
        RequestContext ctx = RequestContext.getCurrentContext();
        HttpServletRequest request = ctx.getRequest();
        log.info(String.format("%s >>> %s", request.getMethod(), request.getRequestURL().toString()));
        Object accessToken = request.getParameter("token");
        if(accessToken == null) {
            log.warn("token is empty");
            ctx.setSendZuulResponse(false);
            ctx.setResponseStatusCode(401);
            try {
                ctx.getResponse().getWriter().write("token is empty");
            }catch (Exception e){}
            return null;
        }
        log.info("ok");
        return null;
    }
}
